pwm: Remove useless whitespace

Remove useless tabs used for padding in structure definitions as well as
some blank lines.

Signed-off-by: Thierry Reding <thierry.reding@gmail.com>

drivers/pwm/core.c

@@ -924,6 +924,5 @@ static int __init pwm_debugfs_init(void)
 
 	return 0;
 }
-
 subsys_initcall(pwm_debugfs_init);
 #endif /* CONFIG_DEBUG_FS */